Guy Henry and Rosie Marcel, who play Henrik Hanssen and Jac Naylor respectively, are seen discussing the roles their characters play in the on-location scenes.

Henry explained: "Another side to Henrik is shown... It's a rather more emotional side."

On whether Hanssen is surprised when Jac visits him in Stockholm, the actor joked: "It's more of an unpleasant shock. It's a ghastly, ghastly moment!"

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The storyline sees Jac head off to find Hanssen to discover why he is blocking a financial offer from a Swedish pharmaceutical company that would pump £40 million into Holby. Viewers then learn more about Hanssen as his past is finally explored.

Holby City airs the special episode on Tuesday, January 8 at 8pm on BBC One.